This is Nautilus, the file manager for the GNOME desktop.
https://wiki.gnome.org/Apps/Nautilus

# Hacking on Nautilus

To build the development version of Nautilus and hack on the code
see the general guide for build the GNOME platform at
are in https://wiki.gnome.org/Newcomers/BuildProject

Guidelines and tutorials to contribute to the GNOME platform
are in https://wiki.gnome.org/Newcomers

# Mailing List

The nautilus mailing list is nautilus-list@gnome.org.  Subscription
information is available at
https://mail.gnome.org/mailman/listinfo/nautilus-list

# How to report bugs

Bugs should be reported to the GNOME bug tracking system at
https://gitlab.gnome.org/GNOME/nautilus/issues.